EP0264349B1 - Dispositif de sécurité pour presse plieuse ou machine analogue - Google Patents

Dispositif de sécurité pour presse plieuse ou machine analogue Download PDF

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Publication number
EP0264349B1
EP0264349B1 EP87810587A EP87810587A EP0264349B1 EP 0264349 B1 EP0264349 B1 EP 0264349B1 EP 87810587 A EP87810587 A EP 87810587A EP 87810587 A EP87810587 A EP 87810587A EP 0264349 B1 EP0264349 B1 EP 0264349B1
Authority
EP
European Patent Office
Prior art keywords
punch
speed
light beam
press
folded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87810587A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0264349A1 (fr
Inventor
Jean-Claude Maillefer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mavilor Systemes SA
Original Assignee
Cybelec SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cybelec SA filed Critical Cybelec SA
Publication of EP0264349A1 publication Critical patent/EP0264349A1/fr
Application granted granted Critical
Publication of EP0264349B1 publication Critical patent/EP0264349B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • the invention relates to a safety device of the light curtain type for a press brake or similar machine.
  • Safety devices of the light barrier type which make it possible to control the immediate stopping of the movement of the machine when the presence of a foreign body, such as for example a tool or the operator's hand, is detected in an area. access prohibited.
  • French patent 2,512,920 This device consists of a laser transmitter, located on one side of the press, emitting a laser beam directed parallel to the edge of the punch and extending in the immediate vicinity of the vertical plane passing through the lower edge of the punch, at the above the upper surface of the piece to be bent, at a distance between the thickness of a finger and the stop stroke of the movement of the punch at low speed. If a body is introduced into the danger zone, either transversely or pushed in front of the downward punch, the stroke of the punch is interrupted. The system is automatically deactivated when the punch reaches the beam. At this time, the distance between the punch and the upper surface of the sheet is such that it is no longer possible to insert a finger into it.
  • This device has the advantage of allowing great freedom to the operator for handling the part to be folded on the machine, unlike for example a light curtain installed on the front of the machine.
  • this device is not fully effective.
  • the reaction time of the press is of the order of 80 to 100 or even 120 milliseconds, the older press brakes sometimes having even much longer downtimes.
  • the high speed of the slide commonly reaching 100 millimeters per second, the resulting stopping distance is of the order of 8 to 12 millimeters.
  • the position of the light beam is generally chosen to be 8 millimeters above the upper surface of the workpiece, so that the operator or another person cannot accidentally introduce their fingers under the punch, after the security has been disabled.
  • the stopping distance being no more than about 2 millimeters, safety is obtained.
  • the press has not been adjusted to shift at low speed above the safety point, the folding is then carried out at high speed and the stopping distance is of the order of 10 to 12 millimeters, and security is no longer ensured.
  • the object of the invention is to provide a safety device of the light curtain type for a press brake or similar machine comprising a light beam of the type described above, arranged so as to allow total safety.
  • the invention relates to a safety device of the light curtain type for a press brake or similar machine as defined in claim 1. Characteristics corresponding to particular embodiments of the safety device are specified in the dependent claims. to claim 1.
  • a light beam 7 is emitted by a source 8, such as for example a laser transmitter, located on one side of the press, and received by a receiver located on the other side of the hurry.
  • the press comprises a punch 1 and a die 2 on which is placed a piece to be bent, such as for example a sheet 3.
  • the edge 5 of the punch moves in a vertical plane 6.
  • the position the laser beam 7 is fixed in this vertical plane or in the vicinity of this vertical plane, at a distance d above the upper surface 4 of the sheet, between the thickness of a finger, generally admitted at 8 millimeters, and the stop stroke of the punch movement at low speed, which is generally of the order of 2 to 3 millimeters.
  • the device intended for measuring the speed of the slide can also be mounted above the safety beam 7 and use another beam or similar device.
  • the measurement of the speed of movement of the punch can for example be carried out using a receiver comprising two photosensitive elements 13, 13 ′ constructed in the same housing 10 and constituting the receiver 9.
  • This arrangement is advantageous because it guarantees an invariable spacing 14 of the photosensitive elements during assembly of the device, whatever the drilling tolerances of the holes 12, 12 ′ of the printed circuit 11.
  • the photosensitive elements can also be mounted in separate boxes.
  • the speed of movement of the punch can be determined by dividing the distance 14 separating the two photosensitive elements 13,13 'by the time interval separating the moment when the first photosensitive element 13 is cut from the moment when the second photosensitive element 13 is cut. '. When the measured speed is greater than a predetermined speed, the stopping of the movement of the punch is immediately controlled.
  • two counters are connected. These counters are triggered when the second photosensitive element 13 ′ is cut off.
  • the device immediately controls the stopping of the movement of the punch.
  • the device can be fitted with a laser transmitter, the modulated radius of which is controlled by two quartz crystals, each of which is arranged so as to monitor the other to guarantee suitable accuracy and avoid any frequency drift, which could distort the measurement of the speed.
  • the device of the invention can be mounted on press brakes as well as on all similar machines, such as for example shears, stamping presses or any machine requiring a change of speed before its work.
EP87810587A 1986-10-14 1987-10-13 Dispositif de sécurité pour presse plieuse ou machine analogue Expired - Lifetime EP0264349B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4098/86A CH669131A5 (fr) 1986-10-14 1986-10-14 Dispositif de securite d'une machine-outil.
CH4098/86 1986-10-14

Publications (2)

Publication Number Publication Date
EP0264349A1 EP0264349A1 (fr) 1988-04-20
EP0264349B1 true EP0264349B1 (fr) 1990-03-07

Family

ID=4269781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810587A Expired - Lifetime EP0264349B1 (fr) 1986-10-14 1987-10-13 Dispositif de sécurité pour presse plieuse ou machine analogue

Country Status (6)

Country Link
US (1) US4907432A (ja)
EP (1) EP0264349B1 (ja)
JP (1) JPH0745118B2 (ja)
CH (1) CH669131A5 (ja)
DE (1) DE3761854D1 (ja)
ES (1) ES2014328B3 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092777A1 (de) * 2000-05-31 2001-12-06 Fiessler Elektronik Ohg Schutzeinrichtung für maschinen, wie abkantpressen, schneidemaschinen, stanzmaschinen oder dergleichen
DE19717299C2 (de) * 1996-08-20 2002-03-14 Fiessler Elektronik Ohg Schutzeinrichtung für Maschinen,insbesondere für Abkantpressen, Schneidemaschinen oder Stanzmaschinen
EP1319886A2 (de) 2001-12-13 2003-06-18 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1387121A2 (de) * 2002-07-31 2004-02-04 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1515078A2 (de) 2003-09-13 2005-03-16 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Abkantpressen, Schneidemaschinen, Stanzmaschinen oder dergleichen

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3178886B2 (ja) * 1992-04-02 2001-06-25 株式会社アマダ プレスブレーキ及びプレスブレーキに使用する光線式安全装置
WO1998047645A1 (de) * 1997-04-23 1998-10-29 Sick Ag Maschine
US6389860B1 (en) 2000-08-11 2002-05-21 Lion Machinery, Inc. Control system for a press brake
US6725702B2 (en) 2001-10-26 2004-04-27 Ariel Financing Ltd. Apparatus and method for overcoming angular deviations in a workpiece
DE10200732B4 (de) 2002-01-11 2004-04-22 Placke Werkzeug-Blechbearbeitungsmaschinen Gmbh Sicherheitsvorrichtung für eine Gesenkbiegepresse
AUPS140902A0 (en) * 2002-03-27 2002-05-09 Lazer Safe Pty Ltd Multiple laser safety system
DE10309399A1 (de) * 2003-03-04 2004-09-16 Sick Ag Sicherungsverfahren und optoelektronischer Sensor
DE102004020024A1 (de) 2004-04-23 2005-11-10 Sick Ag Verfahren zur Sicherung einer Werkzeugmaschine und optoelektronischer Sensor zur Durchführung eines solchen Verfahrens
US20060201225A1 (en) * 2004-08-11 2006-09-14 Joseph Kariakin Metal stud punch system
US8101917B2 (en) * 2006-06-26 2012-01-24 Qualex Manufacturing Llc Method and apparatus for detecting unsafe conditions
US7439512B2 (en) * 2006-06-26 2008-10-21 Qualex Manufacturing Llc Method and apparatus for detecting unsafe conditions
US7924164B1 (en) * 2008-11-05 2011-04-12 Brunswick Corporation Method for sensing the presence of a human body part within a region of a machine tool
US8314393B2 (en) 2008-12-23 2012-11-20 Qualex Manufacturing, Lc Method and apparatus for detecting unsafe conditions
CN102049797A (zh) * 2010-08-27 2011-05-11 昆山裕达塑胶包装有限公司 具有双重保护装置的塑料切割机
EP2644962B1 (de) * 2012-03-30 2015-10-14 Fiessler Elektronik GmbH & Co. KG Umformeinrichtung und Verfahren zum Betreiben der Letzteren
CN103111550B (zh) * 2013-01-28 2015-06-24 孙振刚 折弯机用安全保护器
CN105829792B (zh) * 2013-12-24 2019-10-11 罗伯特·博世有限公司 具有用于感测器具与物体之间的接触的超声波传感器的电动工具
DE102016100445A1 (de) * 2016-01-12 2017-07-13 Pilz Gmbh & Co. Kg Sicherheitseinrichtung und Verfahren zum Überwachen einer Maschine
CN107044584B (zh) * 2017-03-17 2023-06-20 诺亘(上海)工业自动化有限公司 应用于折弯机的单点光幕保护装置以及折弯机
US10197219B1 (en) 2017-08-04 2019-02-05 Jason Boyer Secondary light curtain for detecting crush zone intrusion in a secondary process and associated method for use

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841140A (en) * 1972-12-18 1974-10-15 Dreis & Krump Mfg Co Control system for press brakes and the like
DE2750234C2 (de) * 1977-11-10 1979-09-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schutzeinrichtung für handbediente Werkzeugmaschinen, insbesondere für Abkantpressen
US4166369A (en) * 1978-04-06 1979-09-04 Kabushiki Kaisha Komatsu Seisakusho Safety device for press brake
US4357820A (en) * 1980-01-21 1982-11-09 Bangor Punta Corporation Safety control system for metal forming machine
DE3116292A1 (de) * 1981-04-24 1982-11-11 H. Wohlenberg KG - GmbH & Co, 3000 Hannover Vorrichtung zur herabsetzung der pressbalkendruckkraft bei einer papierschneidemaschine waehrend der schnittandeutung
FR2512920B1 (fr) * 1981-08-06 1986-02-28 Realisa Equip Indls Secur Et Dispositif de protection par une barriere immaterielle
JPS59102298U (ja) * 1982-12-27 1984-07-10 株式会社小松製作所 プレス機械のスライド停止位置制御装置
FR2540224B1 (fr) * 1983-02-01 1986-09-19 Croguennec Philippe Dispositif de protection a faisceaux laser pour machines-outils du genre presses-plieuses
US4660703A (en) * 1983-11-07 1987-04-28 Nevio Filcich Method and apparatus for machine safety
JPS6047000U (ja) * 1984-08-03 1985-04-02 株式会社　ヨシツカ精機 プレス機械における異常動作の検出装置
AT384759B (de) * 1986-06-16 1988-01-11 Haemmerle Ag Verfahren zum steuern einer hebestuetze an blechpressen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19717299C2 (de) * 1996-08-20 2002-03-14 Fiessler Elektronik Ohg Schutzeinrichtung für Maschinen,insbesondere für Abkantpressen, Schneidemaschinen oder Stanzmaschinen
WO2001092777A1 (de) * 2000-05-31 2001-12-06 Fiessler Elektronik Ohg Schutzeinrichtung für maschinen, wie abkantpressen, schneidemaschinen, stanzmaschinen oder dergleichen
US6677574B2 (en) 2000-05-31 2004-01-13 Fiessler Elektronik Ohg Protective device for machines such as bending presses, cutting machines, punching machines or the like
EP1319886A2 (de) 2001-12-13 2003-06-18 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1319886A3 (de) * 2001-12-13 2004-11-17 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1387121A2 (de) * 2002-07-31 2004-02-04 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1387121A3 (de) * 2002-07-31 2005-02-09 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Biegepressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1515078A2 (de) 2003-09-13 2005-03-16 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Abkantpressen, Schneidemaschinen, Stanzmaschinen oder dergleichen
EP1515078A3 (de) * 2003-09-13 2005-07-13 Fiessler Elektronik OHG Schutzeinrichtung für Maschinen, wie Abkantpressen, Schneidemaschinen, Stanzmaschinen oder dergleichen

Also Published As

Publication number Publication date
DE3761854D1 (de) 1990-04-12
CH669131A5 (fr) 1989-02-28
US4907432A (en) 1990-03-13
ES2014328B3 (es) 1990-07-01
JPS63101100A (ja) 1988-05-06
EP0264349A1 (fr) 1988-04-20
JPH0745118B2 (ja) 1995-05-17

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